Air-pump.



Patented Nov.

ATTy

R. C. HILTON.

' Amrum.

APPLICATION FILED IAN-21. I9I6.

' by MM- Y I i 1 a 7 a. I, e mln I NQ. 0 w Hl I F 5 n D am VT all whom t may` concern a citizen of the United States, residing' at Boston, county .of Suffolk, State of Massa-,

` yetihait a comparatively anglesv to Fig. 1;

. ton 3 at 14.

ness of ROLAND c. Eltron, or nosrrfofn comm, on. commu,

Be it lmown that I, ROLAND C. I-Imron,

have invented an Improvementin of which the following descripchusetts, Air-Pumps, tion,

drawing, is aspeciication, like-characters on the drawing representing like parts.

This: invention relates to air' pumps and hasv for its object to provide a novel air pump which is compact in constructionand large capacity. f A pump embodying my invention can used for pumping air for various purposes, b ut the construction herein illustrated has been especiall designed with reference to: use on automov iles for pumping up the tires thereof. i v Y In order to givean 'understanding of my invention I will rst describe a selected embodiment thereof and willjthen point out the novel features in the appended claims.

Figure -1' is a vertical sectional lview through a pump embodying my invention; Fig. .2 is a sectional view taken. at. right 3-3, Fig. 2;` Fig. 4 is a section on the line 4 4, Fig. 2; Fig. 5 is a section on the line 5 5, Fig. 3. g i 1 My improved pump comprises a base member 1 to which is secured a cylinder section 2 within which operates the piston 3.

The base member and cylinder-section may l be secured together in any suitable way, but I have shown them as provided with iianges 4 and 5, respectively, which are bolted together, this being a convenient way to detachably connect these parts. The cylinder member'2 vis provided at its end with an inlet valve 50 of any suitable or usual construction and with an outlet valve 6, said outlet valve having a 'nipple 7 associated therewith to which a delivery pipe 8 may be secured. The piston of the pump 1s actuated from a driving shaft 9 which is journaled in suitable bearings 10 and 11 formed on the base section 1, said shaft having 'an eccentric 12 thereon, the eccentric strap 13 of which is pivotally connected to the pis- The bearings 10 and 11 of the base` section 1 extend into the latter, and

the inner end faces 15 and 16 thereof are spaced apart a distance 'equal'to the thickf A1B-PU.'

specification of Letters Patent. Application led January 2'?, 191,6. SerialNo. 74,708.

in connection with thel accompanying e eccentric 12, said end faces opn- MAss'AcnUsET'rs, AssIGNonT'o wns'r SIDE Fonmmv NEW YORK, A conronrron'or NEW YORK.

rat-enten New. 7, raie.

lzstituting. means for holding the eccentric in position. The eccentric 12 is firmly keyed to the shaft' 9 andthese end faces 15 "and 16 of the bearings 10 and'11 also constitute means for holding Ithe shaft 9 from longitudinal movement in its bearings. The shaft 9 is made of smaller diameter. at one -end than at the-other, the portion 17 of smaller diameter also extending through the eccentric 12 so that the shoulder 18 betweenthe abuts against one face of the eccentric.

.Inassembling the parts, the eccentric be wlth the eccentric 'strap sui/roundingl the In order to make a compact. structure I,

propose to make the liston 3 comparatively short, and in order vto get a pump of the desired capacity I propose to make the cylinder of a large diameter relative to the length of the piston. In order that the pump may work properly it is of course,

necessary that the plston shoud be accurately guided in its movement, but because 'of its comparatively short length it is necessary to provide some auxiliary guiding means other than the contact of the piston with the walls of the cylinder to maintain the piston in proper alinement. The construction I herein provide for this comprises a plurality of guiding pins 19 which are secured to the underside of the piston 3 and depend therefrom, said pins extending into guiding apertures 20 formed `in iianges or extensions 21 that extend laterally from the vinner ends of the bearings 1() and 11. These pins -19 are of Vsufficient, length so that they are not withdrawn from. the apertures 20 even when the piston is in its high- [est position. These guiding pins 19 serve to hold the piston in proper alinement and preven cramped in the cylinder. as might occur without these guiding pins because of the comparativelyv short length of the piston. The pump is lubricated by placing oil or other lubricating material in the chamber.

24 in which the eccentric operates and to it from becoming twistedv orv portions ofthe shaft of diferent'd'iameterprevent an excess of oil from beingv thrown up into the cylinder, I propose to employ a gasket 23 which is situated beneath the piston and` which is supported by the flanges 22 that project inwardly from the walls of` the base member 1 at eachside of the bearings 10 and 11. This gasket is of such a thickness that the underside of the piston vwill come'in contact with the sameat each downward stroke, and the presence of the gasket not only serves as a means for preventing an excess of oil from being thrown up into the cylinder during the rapid operation lof the pump, but also serves as a means for keeping all the parts of the pump properly lubricated. 4 The gasket has an opening 41 therein through which the eccentric and eccentric strap operate, and said gasket hasl contact with these parts during the operation of the pump. The gasket will be of felt or some other material which will absorb oil, and it, therefore, constitutes an oiling pad by which the parts moving therethrough are constantly oiled. At the end of each down stroke,'the lower edge of the piston will contact with.' the pad and will pick-up some oil and thus' the walls of f the cylinder become suiiciently oiled without receiving an excess.

The shaft v9 may be operated in any suitable way. lWhere the pump is used on an automobilefor pumping up the tires. thereof, I propose to provide said shaft with a gear which is splined thereto and which is adapted to be thrown into and out of mesh with a driving gear on some revolving part the hub of the of the automobile mechanism. In the construction herein shown the shaft 9 has a :gear 26 splined thereto which is adapted to mesh with a driving gear 27. lhe gear 26 is moved longitudinally of the shaft to carry it into and out of mesh with the' gear '27 by means of a shifting lever 28 which is en a pivot Apin 3e carried eea yvthe arms 32 an y f 1 of and j .adjusted positions. ceived, said lever beingpivbotally mounted 35' is a clamping bolt which extends through apertures in the arms 32 ands- 33 and which serve to clamp the loop 31 rmly about the hub 30. This ybracket can be clamped on the hub in any desired position eithei` longitudinally of the hub or lsv.' angularly thereof so that it is possible to place the gear-shifting lever 28 in any position in which it can be most easily operated and in which connections thereto can be more easily made. 'I he arm 33' is shown as provided with a resilient extension 36 having a projection 38 situated to be .engaged by the lever 28 as 'the latter is moved about its pivot. rihe resiliency of the eX- tension 36 permits the lever to wipe by the projection 38 assaid lever is turned about its pivot and said projection coperates with the lever to hold it in either of its two adjnsted positions.

Whilel have illustrated herein a selected embodiment of my invention, I do not wish to be limited to the constructional features shown.

I claim:

1. In a pump, the combination with a pump casing having a shaft bearing provided with a hub, `of a driving shaft in said bearing,- a piston operated by said shaft, a gear slidably mounted on the shaft, a bracket adjustably mounted on said hub and lpresenting a portion which surrounds the hub and also presenting two arms, a gear-shifting lever` situatedbetween said arms and pivotally connected thereto, andV means for clamping the bracket to justed position, longer than the the hub in anyadone of said arms being other and being resilient,

4 said arm carrying a projection adapted to engage the lever in different positions thereyieldingly held it in adjusted posi-A tion.` 2. lin a pump, the combination with a pump casing having a shaft bearing provided vvith a hub, of a driving shaft in said bearing, a piston operated by said shaft, a gear slidably mounted on the shaft, a bracket adjustably mounted on the hub, and

a gear-shifting lever pivoted to said bracket y and by which said gear can be shifted longitudinally of'said shaft, said bracket having a resilient extension provided with a locking projection which is adapted to engage the( lever and yieldingly hold it in different lin testimony whereof, I have naine to this specification.

.EULAND C. HLTN.'

signed my 

